+++ /dev/null
-/*
- * COPYRIGHT: See COPYING in the top level directory
- * PROJECT: ReactOS Base API Server DLL
- * FILE: subsystems/win/basesrv/dosdev.c
- * PURPOSE: DOS Devices Management
- * PROGRAMMERS: Pierre Schweitzer (pierre.schweitzer@reactos.org)
- */
-
-/* INCLUDES *******************************************************************/
-
-#include "basesrv.h"
-
-#define NDEBUG
-#include <debug.h>
-
-/* GLOBALS ********************************************************************/
-
-typedef struct _BASE_DOS_DEVICE_HISTORY_ENTRY
-{
- LIST_ENTRY Entry;
- UNICODE_STRING Device;
- UNICODE_STRING Target;
-} BASE_DOS_DEVICE_HISTORY_ENTRY, *PBASE_DOS_DEVICE_HISTORY_ENTRY;
-
-static RTL_CRITICAL_SECTION BaseDefineDosDeviceCritSec;
-static LIST_ENTRY DosDeviceHistory;
-
-/* PRIVATE FUNCTIONS **********************************************************/
-
-VOID BaseInitDefineDosDevice(VOID)
-{
- RtlInitializeCriticalSection(&BaseDefineDosDeviceCritSec);
- InitializeListHead(&DosDeviceHistory);
-}
-
-VOID BaseCleanupDefineDosDevice(VOID)
-{
- PLIST_ENTRY Entry, ListHead;
- PBASE_DOS_DEVICE_HISTORY_ENTRY HistoryEntry;
-
- RtlDeleteCriticalSection(&BaseDefineDosDeviceCritSec);
-
- ListHead = &DosDeviceHistory;
- Entry = ListHead->Flink;
- while (Entry != ListHead)
- {
- HistoryEntry = (PBASE_DOS_DEVICE_HISTORY_ENTRY)
- CONTAINING_RECORD(Entry,
- BASE_DOS_DEVICE_HISTORY_ENTRY,
- Entry);
- Entry = Entry->Flink;
-
- if (HistoryEntry)
- {
- if (HistoryEntry->Target.Buffer)
- {
- RtlFreeHeap(BaseSrvHeap,
- 0,
- HistoryEntry->Target.Buffer);
- }
- if (HistoryEntry->Device.Buffer)
- {
- RtlFreeHeap(BaseSrvHeap,
- 0,
- HistoryEntry->Device.Buffer);
- }
- RtlFreeHeap(BaseSrvHeap,
- 0,
- HistoryEntry);
- }
- }
-}
-
-/* PUBLIC SERVER APIS *********************************************************/
-
-CSR_API(BaseSrvDefineDosDevice)
-{
- NTSTATUS Status;
- PBASE_DEFINE_DOS_DEVICE DefineDosDeviceRequest = &((PBASE_API_MESSAGE)ApiMessage)->Data.DefineDosDeviceRequest;
- OBJECT_ATTRIBUTES ObjectAttributes;
- HANDLE LinkHandle = NULL;
- UNICODE_STRING DeviceName = {0};
- UNICODE_STRING RequestDeviceName = {0};
- UNICODE_STRING LinkTarget = {0};
- PUNICODE_STRING RequestLinkTarget;
- ULONG Length;
- SID_IDENTIFIER_AUTHORITY WorldAuthority = {SECURITY_WORLD_SID_AUTHORITY};
- SID_IDENTIFIER_AUTHORITY SystemAuthority = {SECURITY_NT_AUTHORITY};
- PSECURITY_DESCRIPTOR SecurityDescriptor;
- PACL Dacl;
- PSID AdminSid;
- PSID SystemSid;
- PSID WorldSid;
- ULONG SidLength;
- PBASE_DOS_DEVICE_HISTORY_ENTRY HistoryEntry;
- PLIST_ENTRY Entry;
- PLIST_ENTRY ListHead;
- BOOLEAN Matched, AddHistory;
- DWORD dwFlags;
- PWSTR lpBuffer;
-
- DPRINT("BaseSrvDefineDosDevice entered, Flags:%d, DeviceName:%wZ, TargetPath:%wZ\n",
- DefineDosDeviceRequest->Flags,
- &DefineDosDeviceRequest->DeviceName,
- &DefineDosDeviceRequest->TargetPath);
-
- Matched = AddHistory = FALSE;
- HistoryEntry = NULL;
- AdminSid = SystemSid = WorldSid = NULL;
- SecurityDescriptor = NULL;
- ListHead = &DosDeviceHistory;
- dwFlags = DefineDosDeviceRequest->Flags;
-
- /* Validate the flags */
- if ( (dwFlags & 0xFFFFFFF0) ||
- ((dwFlags & DDD_EXACT_MATCH_ON_REMOVE) &&
- !(dwFlags & DDD_REMOVE_DEFINITION)) )
- {
- return STATUS_INVALID_PARAMETER;
- }
-
- Status = RtlEnterCriticalSection(&BaseDefineDosDeviceCritSec);
- if (!NT_SUCCESS(Status))
- {
- DPRINT1("RtlEnterCriticalSection() failed (Status %lx)\n",
- Status);
- return Status;
- }
-
- _SEH2_TRY
- {
- Status =
- RtlUpcaseUnicodeString(&RequestDeviceName,
- &DefineDosDeviceRequest->DeviceName,
- TRUE);
- if (!NT_SUCCESS(Status))
- _SEH2_LEAVE;
-
- RequestLinkTarget = &DefineDosDeviceRequest->TargetPath;
- lpBuffer = (PWSTR)RtlAllocateHeap(BaseSrvHeap,
- HEAP_ZERO_MEMORY,
- RequestDeviceName.MaximumLength + 5 * sizeof(WCHAR));
- if (!lpBuffer)
- {
- DPRINT1("Failed to allocate memory\n");
- Status = STATUS_NO_MEMORY;
- _SEH2_LEAVE;
- }
-
- swprintf(lpBuffer,
- L"\\??\\%wZ",
- &RequestDeviceName);
- RtlInitUnicodeString(&DeviceName,
- lpBuffer);
- InitializeObjectAttributes(&ObjectAttributes,
- &DeviceName,
- OBJ_CASE_INSENSITIVE,
- NULL,
- NULL);
- Status = NtOpenSymbolicLinkObject(&LinkHandle,
- DELETE | 0x1,
- &ObjectAttributes);
- if (NT_SUCCESS(Status))
- {
- Status = NtQuerySymbolicLinkObject(LinkHandle,
- &LinkTarget,
- &Length);
- if (!NT_SUCCESS(Status) &&
- Status == STATUS_BUFFER_TOO_SMALL)
- {
- LinkTarget.Length = 0;
- LinkTarget.MaximumLength = Length;
- LinkTarget.Buffer = (PWSTR)
- RtlAllocateHeap(BaseSrvHeap,
- HEAP_ZERO_MEMORY,
- Length);
- if (!LinkTarget.Buffer)
- {
- DPRINT1("Failed to allocate memory\n");
- Status = STATUS_NO_MEMORY;
- _SEH2_LEAVE;
- }
-
- Status = NtQuerySymbolicLinkObject(LinkHandle,
- &LinkTarget,
- &Length);
- }
-
- if (!NT_SUCCESS(Status))
- {
- DPRINT1("NtQuerySymbolicLinkObject(%wZ) failed (Status %lx)\n",
- &DeviceName, Status);
- _SEH2_LEAVE;
- }
-
- if ((dwFlags & DDD_REMOVE_DEFINITION))
- {
- /* If no target name specified we remove the current symlink target */
- if (RequestLinkTarget->Length == 0)
- Matched = TRUE;
- else
- {
- if (dwFlags & DDD_EXACT_MATCH_ON_REMOVE)
- Matched = !RtlCompareUnicodeString(RequestLinkTarget,
- &LinkTarget,
- TRUE);
- else
- Matched = RtlPrefixUnicodeString(RequestLinkTarget,
- &LinkTarget,
- TRUE);
- }
-
- if (Matched && IsListEmpty(ListHead))
- {
- /* Current symlink target macthed and there is nothing to revert to */
- RequestLinkTarget = NULL;
- }
- else if (Matched && !IsListEmpty(ListHead))
- {
- /*
- * Fetch the first history entry we come across for the device name.
- * This will become the current symlink target for the device name.
- */
- Matched = FALSE;
- Entry = ListHead->Flink;
- while (Entry != ListHead)
- {
- HistoryEntry = (PBASE_DOS_DEVICE_HISTORY_ENTRY)
- CONTAINING_RECORD(Entry,
- BASE_DOS_DEVICE_HISTORY_ENTRY,
- Entry);
- Matched =
- !RtlCompareUnicodeString(&RequestDeviceName,
- &HistoryEntry->Device,
- FALSE);
- if (Matched)
- {
- RemoveEntryList(&HistoryEntry->Entry);
- RequestLinkTarget = &HistoryEntry->Target;
- break;
- }
- Entry = Entry->Flink;
- HistoryEntry = NULL;
- }
-
- /* Nothing to revert to so delete the symlink */
- if (!Matched)
- RequestLinkTarget = NULL;
- }
- else if (!Matched)
- {
- /*
- * Locate a previous symlink target as we did not get
- * a hit earlier. If we find one we need to remove it.
- */
- Entry = ListHead->Flink;
- while (Entry != ListHead)
- {
- HistoryEntry = (PBASE_DOS_DEVICE_HISTORY_ENTRY)
- CONTAINING_RECORD(Entry,
- BASE_DOS_DEVICE_HISTORY_ENTRY,
- Entry);
- Matched =
- !RtlCompareUnicodeString(&RequestDeviceName,
- &HistoryEntry->Device,
- FALSE);
- if (!Matched)
- {
- HistoryEntry = NULL;
- Entry = Entry->Flink;
- continue;
- }
-
- Matched = FALSE;
- if (dwFlags & DDD_EXACT_MATCH_ON_REMOVE)
- {
- if (!RtlCompareUnicodeString(RequestLinkTarget,
- &HistoryEntry->Target,
- TRUE))
- {
- Matched = TRUE;
- }
- }
- else if (RtlPrefixUnicodeString(RequestLinkTarget,
- &HistoryEntry->Target,
- TRUE))
- {
- Matched = TRUE;
- }
-
- if (Matched)
- {
- RemoveEntryList(&HistoryEntry->Entry);
- break;
- }
- Entry = Entry->Flink;
- HistoryEntry = NULL;
- }
-
- /* Leave existing symlink as is */
- if (!Matched)
- Status = STATUS_OBJECT_NAME_NOT_FOUND;
- else
- Status = STATUS_SUCCESS;
- _SEH2_LEAVE;
- }
- }
- else
- {
- AddHistory = TRUE;
- }
-
- Status = NtMakeTemporaryObject(LinkHandle);
- if (!NT_SUCCESS(Status))
- {
- DPRINT1("NtMakeTemporaryObject(%wZ) failed (Status %lx)\n",
- &DeviceName, Status);
- _SEH2_LEAVE;
- }
-
- Status = NtClose(LinkHandle);
- LinkHandle = NULL;
- if (!NT_SUCCESS(Status))
- {
- DPRINT1("NtClose(%wZ) failed (Status %lx)\n",
- &DeviceName, Status);
- _SEH2_LEAVE;
- }
- }
-
- /* Don't create symlink if we don't have a target */
- if (!RequestLinkTarget || RequestLinkTarget->Length == 0)
- _SEH2_LEAVE;
-
- if (AddHistory)
- {
- HistoryEntry = (PBASE_DOS_DEVICE_HISTORY_ENTRY)
- RtlAllocateHeap(BaseSrvHeap,
- HEAP_ZERO_MEMORY,
- sizeof(BASE_DOS_DEVICE_HISTORY_ENTRY));
- if (!HistoryEntry)
- {
- DPRINT1("Failed to allocate memory\n");
- Status = STATUS_NO_MEMORY;
- _SEH2_LEAVE;
- }
-
- HistoryEntry->Target.Buffer =
- RtlAllocateHeap(BaseSrvHeap,
- HEAP_ZERO_MEMORY,
- LinkTarget.Length);
- if (!HistoryEntry->Target.Buffer)
- {
- DPRINT1("Failed to allocate memory\n");
- Status = STATUS_NO_MEMORY;
- _SEH2_LEAVE;
- }
- HistoryEntry->Target.Length =
- HistoryEntry->Target.MaximumLength =
- LinkTarget.Length;
- RtlCopyUnicodeString(&HistoryEntry->Target,
- &LinkTarget);
-
- HistoryEntry->Device.Buffer =
- RtlAllocateHeap(BaseSrvHeap,
- HEAP_ZERO_MEMORY,
- RequestDeviceName.Length);
- if (!HistoryEntry->Device.Buffer)
- {
- DPRINT1("Failed to allocate memory\n");
- Status = STATUS_NO_MEMORY;
- _SEH2_LEAVE;
- }
- HistoryEntry->Device.Length =
- HistoryEntry->Device.MaximumLength =
- RequestDeviceName.Length;
- RtlCopyUnicodeString(&HistoryEntry->Device,
- &RequestDeviceName);
-
- /* Remember previous symlink target for this device */
- InsertHeadList(ListHead,
- &HistoryEntry->Entry);
- HistoryEntry = NULL;
- }
-
- RtlAllocateAndInitializeSid(&WorldAuthority,
- 1,
- SECURITY_WORLD_RID,
- SECURITY_NULL_RID,
- SECURITY_NULL_RID,
- SECURITY_NULL_RID,
- SECURITY_NULL_RID,
- SECURITY_NULL_RID,
- SECURITY_NULL_RID,
- SECURITY_NULL_RID,
- &WorldSid);
-
- RtlAllocateAndInitializeSid(&SystemAuthority,
- 1,
- SECURITY_LOCAL_SYSTEM_RID,
- SECURITY_NULL_RID,
- SECURITY_NULL_RID,
- SECURITY_NULL_RID,
- SECURITY_NULL_RID,
- SECURITY_NULL_RID,
- SECURITY_NULL_RID,
- SECURITY_NULL_RID,
- &SystemSid);
-
- RtlAllocateAndInitializeSid(&SystemAuthority,
- 2,
- SECURITY_BUILTIN_DOMAIN_RID,
- DOMAIN_ALIAS_RID_ADMINS,
- SECURITY_NULL_RID,
- SECURITY_NULL_RID,
- SECURITY_NULL_RID,
- SECURITY_NULL_RID,
- SECURITY_NULL_RID,
- SECURITY_NULL_RID,
- &AdminSid);
-
- SidLength = RtlLengthSid(SystemSid) +
- RtlLengthSid(AdminSid) +
- RtlLengthSid(WorldSid);
- Length = sizeof(ACL) + SidLength + 3 * sizeof(ACCESS_ALLOWED_ACE);
-
- SecurityDescriptor = RtlAllocateHeap(BaseSrvHeap,
- 0,
- SECURITY_DESCRIPTOR_MIN_LENGTH + Length);
- if (!SecurityDescriptor)
- {
- DPRINT1("Failed to allocate memory\n");
- Status = STATUS_NO_MEMORY;
- _SEH2_LEAVE;
- }
-
- Dacl = (PACL)((ULONG_PTR)SecurityDescriptor + SECURITY_DESCRIPTOR_MIN_LENGTH);
- Status = RtlCreateSecurityDescriptor(SecurityDescriptor,
- SECURITY_DESCRIPTOR_REVISION);
- if (!NT_SUCCESS(Status))
- {
- DPRINT1("RtlCreateSecurityDescriptor() failed (Status %lx)\n", Status);
- _SEH2_LEAVE;
- }
-
- Status = RtlCreateAcl(Dacl,
- Length,
- ACL_REVISION);
- if (!NT_SUCCESS(Status))
- {
- DPRINT1("RtlCreateAcl() failed (Status %lx)\n", Status);
- _SEH2_LEAVE;
- }
-
- RtlAddAccessAllowedAce(Dacl,
- ACL_REVISION,
- GENERIC_ALL,
- SystemSid);
- RtlAddAccessAllowedAce(Dacl,
- ACL_REVISION,
- GENERIC_ALL,
- AdminSid);
- RtlAddAccessAllowedAce(Dacl,
- ACL_REVISION,
- STANDARD_RIGHTS_READ,
- WorldSid);
-
- Status = RtlSetDaclSecurityDescriptor(SecurityDescriptor,
- TRUE,
- Dacl,
- FALSE);
- if (!NT_SUCCESS(Status))
- {
- DPRINT1("RtlSetDaclSecurityDescriptor() failed (Status %lx)\n", Status);
- _SEH2_LEAVE;
- }
-
- InitializeObjectAttributes(&ObjectAttributes,
- &DeviceName,
- OBJ_CASE_INSENSITIVE,
- NULL,
- SecurityDescriptor);
- Status = NtCreateSymbolicLinkObject(&LinkHandle,
- SYMBOLIC_LINK_ALL_ACCESS,
- &ObjectAttributes,
- RequestLinkTarget);
- if (NT_SUCCESS(Status))
- {
- Status = NtMakePermanentObject(LinkHandle);
- if (!NT_SUCCESS(Status))
- {
- DPRINT1("NtMakePermanentObject(%wZ) failed (Status %lx)\n",
- &DeviceName, Status);
- }
- }
- else
- {
- DPRINT1("NtCreateSymbolicLinkObject(%wZ) failed (Status %lx)\n",
- &DeviceName, Status);
- }
- }
- _SEH2_FINALLY
- {
- RtlLeaveCriticalSection(&BaseDefineDosDeviceCritSec);
- if (DeviceName.Buffer)
- {
- RtlFreeHeap(BaseSrvHeap,
- 0,
- DeviceName.Buffer);
- }
- if (LinkTarget.Buffer)
- {
- RtlFreeHeap(BaseSrvHeap,
- 0,
- LinkTarget.Buffer);
- }
- if (SecurityDescriptor)
- {
- RtlFreeHeap(BaseSrvHeap,
- 0,
- SecurityDescriptor);
- }
-
- if (LinkHandle) NtClose(LinkHandle);
- if (SystemSid) RtlFreeSid(SystemSid);
- if (AdminSid) RtlFreeSid(AdminSid);
- if (WorldSid) RtlFreeSid(WorldSid);
-
- RtlFreeUnicodeString(&RequestDeviceName);
-
- if (HistoryEntry)
- {
- if (HistoryEntry->Target.Buffer)
- {
- RtlFreeHeap(BaseSrvHeap,
- 0,
- HistoryEntry->Target.Buffer);
- }
- if (HistoryEntry->Device.Buffer)
- {
- RtlFreeHeap(BaseSrvHeap,
- 0,
- HistoryEntry->Device.Buffer);
- }
- RtlFreeHeap(BaseSrvHeap,
- 0,
- HistoryEntry);
- }
- }
- _SEH2_END
-
- DPRINT("BaseSrvDefineDosDevice exit, Status: 0x%x\n", Status);
- return Status;
-}
-
-/* EOF */
projects / reactos.git / blobdiff